RESIDUAL WATER NUCLEI. 



ICQ 



These results were now varied by bringing to bear stronger radiation 

 obtained from an X-ray bulb placed at successively decreasing distances 

 D from the fog chamber. In series 7 and 8, = 40, in series 9 and 10, 

 D = 2o cm. and in series n and 12, D = i2 cm. (about) from the axis of 

 the fog chamber. The enormous initial radiations drop off rapidly in 

 the same way as in the preceding case. All the series are consistent, 

 except the eleventh, in which the initial drop is too large compared with 

 the others. It was customary to keep the exhaust cock open for 5 

 seconds, after which the filter cock was opened to dispel the fog, i minute 

 being allowed between the exhaustions. The results are shown in detail 

 in fig. 34, a, b, c, together with similar data for vapor nuclei and for phos- 

 phorus nuclei. 



TABLE 47. Vapor nuclei. Fog chamber standardized. 



'Water nuclei removed by exhaustion, but not the vapor nuclei. 



